( )this is_eraser and that's_ldcard.[a.a;anb.a;a c.an;a d.an

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()thisis_eraserandthat''s_ldcard.[a.a;anb.a;ac.an;ad.an()thisis_eraserandthat''s_ldcard.[a.a;anb.a;ac.

( )this is_eraser and that's_ldcard.[a.a;anb.a;a c.an;a d.an
( )this is_eraser and that's_ldcard.[a.a;an
b.a;a c.an;a d.an

( )this is_eraser and that's_ldcard.[a.a;anb.a;a c.an;a d.an
D an ,an
元音前用an ,所以两个都是填 an

an, an